Improvement in photographic baths



' PATENTE@ NOV. 14, 1865.

T.. H G I R W N.

PHOTOGRAPHIG BATH.

\ Zia/n? my www UNITED STATES PATENT OFFICE.

NELSON IV RIGHT, OF NEW YORK, N. Y.

IMPROVEMENT IN PHOTOGRAPHIC BATHS.

Speciiication forming part ot' Letters Patent No. 50,981, dated November14, 1865.

To all Iwhom it may concern Beit known that I, NELSON WRIGHT, of thecity, county, and State of New York, have invented, made, and applied touse certain new and useful Improvements in Photographie Baths; and I dodeclare the following to be a full, clear, and correct description ofthe same, reference bcingliad to the accompanying drawings, making partot this specitication, and to the letters ot' reference marked thereon,in which- Figure 1 is a vertical section of my improved photographicbath; Fig. 2, an end view ot the same; Fig. 3, a top view of the same.

In the drawings like parts of the invention are designated bythe sameletters ot' reference.

The present invention relates to certain improvements in theconstruction of a photographic bath patented by Bernhard Hufnagel,October 5, 1858, reissued March-19, 1861, and assigned to the presentapplicant.

The object of the present invention is to produce a silver-bath forphotographic use which shall more perfectly than heretofore preserve thesolution of silver deposited therein from all foreign action and allowthe same to be -used a great number of times and until all the silver isexhausted.

The nature ot' my invention consists in the use or employment ot' therubber packing, arranged as hereinafter fully described, for the purposefully set forth.

To enable those skilled in the art to make and use my invention, I willspeak ofthe construction of the same.

A shows a framing, to which the front and back sides B are att-ached byscrews b, so as to form together a close box or outer casing. The frontand back sides are arranged with doors or panels C, which may beremovedat any time for the purpose ot' examining the solution in the bathwithout the necessity of emptying said solution each time. Said doors orpanels are so arranged that they may close perfectly tight and not admitany light to the interior of the box when closed.

Within the box, at each end of the same, I place a packing of vulcanizedindia-rubber, D, extending from one side ot the box to the other, andextending from the top ot' the box to the bottom, also provided with apacking of vulcanized rubber. This packing for the ends and bottom Iprefer should be made of one and the same piece of rubber, and it isgrooved suiciently to admit ot' theintroduction of the plates of glass,which, when inserted within these grooves, forni the sides ot' the bath.

The rubber packing, when arranged as shown, forms a perfectly-tightjoint around the sides and bot-tom ot' the glass plates, and at the sametime prevents the solution from coming iu contact with the framing whichcontains and supports the plates of glass.

F shows the cover of the box, lined on its under side with a thin stripof rubber to prevent any injurious action of the solution upon thewooden part ot the box, and to aid in the formation, when closed tightlyupon the box, ot` a perfectly-tight box. This cover, instead of beinghinged, as in the Hnfnagel patent, is dovetailed, and slides snugly andreadily within 'the ways formed to receive it at the top of the box. Therubber lining is made about the length of the plates of glass employed.

Attached to the box upon each side are the plates of metal G, providedwith the journals H, upon which journals are held the yokes I, providedwith the set-screws J. These yokes I swing readily upon the journals H,and, after the cover has been inserted to its full extent within thewaysthat receive it, are swung directly over the saine, so that theset-screws may be depressed and bear directly upon the upper side of thecover until the cover be sufeiently depressed to form, with the rubberpacking, a perfectly-tight box. In constructing my improved bath thethickness of the glass plates and of the india-rubber packing is made,according to the size ot the bath, from one-eighth of an inch to half aninch thicker than the wooden frame or sidesI of the box. One of thesides is first firmly secured to the frame. The rubber packing is thenplaced in position, the plates of glass inserted within the groovedportion of the same, the opposite side added, after which, the otherportions of the bath having been added, the same is ready for use.

The special features of my improvements are that by extending the rubberso that the same shall not only be between the plates of glass, butextend beyond them, or, more properly speaking, that the plates of glassused shall be inclosed at their ends and bottom within the rubberpacking, as shown, I am enabled to form e more perfectlyftigh, joint inthe construction of :i photographic bath than can' be formed if theHufnagel mode of construction be carried out., Again, I can use oremploy a cheaper article of glass', and holding the seme, as I do,securely 'within the rubloer pecking, thelsbility of the seme to breuk,either by handling or transporting, is greatly'reduoed,

The second feature, which consists in attaching the yokes or clampsdirectly 'to .the bath, enables me toV depress the oover'to iesfnl-le;x. tent more readily and certainlyfthen ifrthe removable clumps oryokes in common use be employed, thus tending in e great degree tolessen the risk of leakage occasioned by a loose cover, or one notproperly depressed.

pose specified.

` NELSON WRIGHT.

In vpresence of-f A.YSU1NEY DoANE, W.. I. BUCK.

